Continuity mistake: When Ice Cube is on the train, and the kids have gotten off, he is running inside the train to keep along side of the kids standing on the outside. As the train speeds up, just before he jumps off, the camera looks back at the kids and they are standing right at the end of the line (dead end) stop. So the train would have been coming from where there was no track.
Continuity mistake: When Nick snatches Kevin's juice, some of it gets on Nick's face and begins to run down his cheek. However, in the next shot, the juice is gone. Nick's hands are visible throughout the scene, so he couldn't have wiped it off.
Continuity mistake: When Nick leaves the dealership in his new Navigator, the car sticker in the driver-side back window changes from being centered to being much lower by the time he parks in front of his business.